2 ,s, and s, are the sum of first n, 2n and 3n terms of a geometric se – InterviewSolution

1.	2 ,s, and s, are the sum of first n, 2n and 3n terms of a geometric series respectivelye prove that S_{1}\left(S_{3}-S_{2}\right)=\left(S_{2}-S_{1}\right)^{2}
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